Koppers Reports Achievements in Safety, Sustainability and Financial Performance

SEC Filings
Filing date Form Description Filing Group View
PRE 14A

A preliminary proxy statement providing notification matters to be brought to a vote

Proxy Filings
EX-101.SCH - XBRL TAXONOMY EXTENSION SCHEMA
4

Statement of changes in beneficial ownership of securities

3,4,5
4

Statement of changes in beneficial ownership of securities

3,4,5
4

Statement of changes in beneficial ownership of securities

3,4,5
4

Statement of changes in beneficial ownership of securities

3,4,5
144

Filed by "insiders" prior intended sale of restricted stock. Non-EDGAR filing

Other
144

Filed by "insiders" prior intended sale of restricted stock. Non-EDGAR filing

Other
144/A

Amendment to a previously filed 144

Other
144

Filed by "insiders" prior intended sale of restricted stock. Non-EDGAR filing

Other
4

Statement of changes in beneficial ownership of securities

3,4,5